How to get a Model's collection_names?
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Nickolas Daskalou
Feb 18, 2010, 10:33:59 PM2/18/10
to Google App Engine
Say I have these Models:
class Model2(db.Model):
class Model3(db.Model):
class Model1(db.Model):
....
class Model2(db.Model):
model1 = db.ReferenceProperty(Model1, collection_name = 'model2s')
....
class Model3(db.Model):
model1 = db.ReferenceProperty(Model1, collection_name = 'model3s')
....
Would this be the best way to get all of Model1's collection_names?
collection_names = [name for name in dir(Model1) if isinstance(getattr(Model1,name), db.Query)]
Is there a better way?
Nickolas Daskalou
Feb 19, 2010, 12:31:44 AM2/19/10
to Google App Engine
In fact that code I wrote doesn't work because in the SDK the collection_names are instances of db._ReverseReferenceProperty, not db.Query.
Since "_ReverseReferenceProperty" starts with "_", it's not safe to assume that the collection_names will continue to be instances of db._ReverseReferenceProperty, correct?
Has anyone done something similar that works and is safe to use?
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